Proper unicode-range font loading behavior

LayoutTests/svg/W3C-SVG-1.1-SE/text-intro-09-b.svg

 <svg version="1.1" baseProfile="basic" id="svg-root"
   width="100%" height="100%" viewBox="0 0 480 360"
   xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
   <!--======================================================================-->
   <!--=  SVG 1.1 2nd Edition Test Case                                     =-->
   <!--======================================================================-->
   <!--=  Copyright 2009 World Wide Web Consortium, (Massachusetts          =-->
   <!--=  Institute of Technology, European Research Consortium for         =-->
   <!--=  Informatics and Mathematics (ERCIM), Keio University).            =-->
   <!--=  All Rights Reserved.                                              =-->
@@ skipping 68 matching lines @@
   <g font-family="SVGFreeSansASCII,sans-serif" font-size="32">
     <text id="revision" x="10" y="340" stroke="none" fill="black">$Revision: 1.6 $</text>
   </g>
   <rect id="test-frame" x="1" y="1" width="478" height="358" fill="none" stroke="#000000"/>
   <!-- comment out this watermark once the test is approved -->
   <!--<g id="draft-watermark">
     <rect x="1" y="1" width="478" height="20" fill="red" stroke="black" stroke-width="1"/>
     <text font-family="SVGFreeSansASCII,sans-serif" font-weight="bold" font-size="20" x="240"
       text-anchor="middle" y="18" stroke-width="0.5" stroke="black" fill="white">DRAFT</text>
   </g>-->
+ <script>
+     if (window.testRunner) {
+         testRunner.waitUntilDone();
+         pendingFonts = 3;
+         document.fonts.onloadingdone = document.fonts.onloadingerror = function(e) {
+             pendingFonts -= e.fontfaces.length;
+             if (pendingFonts == 0)
+                 testRunner.notifyDone();
+         };
+     }
+ </script>
 </svg>